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We tested 3 competing hypotheses regarding the relation between pubertal timing and substance initiation in adolescence: the early timing, off-time, and stressful change hypotheses. We used longitudinal data from the Developmental Pathways Project (N = 521). Youth reported whether they had ever tried alcohol, tobacco, or marijuana at baseline, and then again at 6-, 12-, 18-, 24-, 36-, and 72-month follow-up interviews. We estimated interval censored parametric survival models and tested interactions between pubertal timing and gender and race variables. We found robust support for the early timing hypothesis, but no support for the off-time and the stressful change hypotheses.

In this study we examined cognitive features that have been posited to contribute to depressive vulnerability in adolescents. Using a longitudinal sample of 331 young adolescents followed from 6th to 7th grade, cross-lagged structural equation analyses were conducted. Controlling for baseline levels of depressive, conduct, and anxiety symptoms, low self-worth was associated with a vulnerability to both depressive symptoms and conduct problems, whereas rejection sensitivity was uniquely predictive of increases in anxiety. In support of cognitive "scar" models, baseline depressive and conduct problems were both predictive of a more negative attributional style. Depressive symptoms also predicted more rejection sensitivity, whereas conduct problems predicted lower self-esteem.